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arXiv 1409.4495astro-ph.GA
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SAMI星系巡天:在矮星系GAMA J141103中发现发光的低金属量H II复合体。

The SAMI Galaxy Survey: The discovery of a luminous, low-metallicity H II complex in the dwarf galaxy GAMA J141103.98-003242.3

S. N. Richards, A. L. Schaefer, A. R. Lopez-Sanchez, S. M. Croom, J. J. Bryant, S. M. Sweet, I. S. Konstantopoulos, J. T. Allen, J. Bland-Hawthorn, J. V. Bloom,… 展开作者

S. N. Richards, A. L. Schaefer, A. R. Lopez-Sanchez, S. M. Croom, J. J. Bryant, S. M. Sweet, I. S. Konstantopoulos, J. T. Allen, J. Bland-Hawthorn, J. V. Bloom, S. Brough, L. M. R. Fogarty, M. Goodwin, A. W. Green, I. -T. Ho, L. J. Kewley, B. S. Koribalski, J. S. Lawrence, M. S. Owers, E. M. Sadler, R. Sharp

摘要:

我们提出了一个明亮的未解决的H II复杂的矮星系GAMA J141103.98-003242.3的边缘使用悉尼AAO多目标积分场摄谱仪(SAMI)星系巡天的数据的发现。这个矮星系位于~100 Mpc的距离处,包含一个未解析的H II发射区,它贡献了星系H_alpha光度的~ 70%,位于已建立的H II区光度函数的顶端。对于H II复合体,我们测量到的恒星形成速率为0.147 \pm 0.041 M太阳年^-1,金属丰度为12+log(O/H)= 8.01 \pm 0.05,比星系的其他部分低约0.2 dex。来自H I帕克斯全天巡天(HIPASS)的数据表明,银河系中可能存在中性氢,可能为正在进行的和未来的恒星形成事件提供燃料。我们讨论了各种触发机制的强烈的恒星形成活动的H II复杂的,电离气体的运动学很好地描述了一个旋转盘,并没有显示任何功能指示的相互作用。我们表明,SAMI是一个理想的工具,以确定类似的系统GAMA J141103.98-003242.3,和SAMI星系调查很可能会发现更多的这些系统,以帮助了解他们的形成和演变。

英文摘要:

We present the discovery of a luminous unresolved H II complex on the edge of dwarf galaxy GAMA J141103.98-003242.3 using data from the Sydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. This dwarf galaxy is situated at a distance of ~100 Mpc and contains an unresolved region of H II emission that contributes ~70 per cent of the galaxy's H_alpha luminosity, located at the top end of established H II region luminosity functions. For the H II complex, we measure a star-formation rate of 0.147\pm0.041 M_solar yr^-1 and a metallicity of 12+log(O/H) = 8.01\pm0.05 that is lower than the rest of the galaxy by ~0.2 dex. Data from the H I Parkes All-Sky Survey (HIPASS) indicate the likely presence of neutral hydrogen in the galaxy to potentially fuel ongoing and future star-forming events. We discuss various triggering mechanisms for the intense star-formation activity of this H II complex, where the kinematics of the ionised gas are well described by a rotating disc and do not show any features indicative of interactions. We show that SAMI is an ideal instrument to identify similar systems to GAMA J141103.98-003242.3, and the SAMI Galaxy Survey is likely to find many more of these systems to aid in the understanding of their formation and evolution.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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